Shanna Alexander is a board-certified Senior Toxicologist at EarthCon Consultant (EarthCon) in Atlanta, Georgia, specializing in vapor intrusion risk analysis, human health and ecological risk assessment. She is responsible for preparing human and ecological risk assessment reports for clients in support of risk-based site closures at a variety of sites. Since 2003, she has worked collaboratively with federal, state, and local health and regulatory agencies to address concerns related to human and ecological exposures to environmental contaminants. She has worked on risk assessments incorporating geospatial analysis and site-specific bioavailability. Prior to EarthCon, she worked as the Risk Assessment Program Manager and toxicologist for the Georgia Environmental Protection Division (GA EPD) for 13 years and an environmental risk assessor for Golder and Associates for 2 years. During her time at GA EPD, she helped evaluate and oversee the application of state and federal rules and guidance to assess, document, defend, and make health risk determinations in accordance with Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Resource Conservation and Recovery Act (RCRA), Georgia VRP Act, Georgia Rules for Hazardous Site Response, Georgia Hazardous Waste Management Act, and the Georgia Brownfield Act. Shanna has contributed to ITRC as a team member for the Risk Assessment, TPH Risk, and Geostatistics for Remediation Optimization teams. She earned a bachelor's degree in Molecular Biology and Chemistry from the University of Nebraska in 2002 and Master's degrees in Toxicology and Public Health from Louisiana State University in Baton Rouge, Louisiana in 2003 and Emory University in Atlanta, Georgia in 2006.